Best distro for flash games?

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http://crunchbanglinux.org – Hi all, I'm looking for some advice on a distro to install on my mom's desktop. I don't know the exact specs, but it's a moderate-level Dell purchased new a few months after Windows Vista was released.My mom is terrible with computers and only uses it to play flash games (mostly on Facebook) and store digital photos. She's convinced she needs a new computer since hers is "getting slow," but I told her all she needs is the OS reinstalled. She doesn't have Vista restore disks, so I thought I'd put some idiot-proof version of Linux on it for her since (HowTos)